Module 19 Vocabulary

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Across
  1. 3. states that atoms, ions, and molecules must colloid in order to react
  2. 8. a reaction in which two or more substances combine to form another substance
  3. 14. a state in which forward and reverse reactions occur at the same rate.
  4. 19. an insoluble compound that comes out of a solution
  5. 21. the rate at which reactants change into products
  6. 23. reaction that requires more energy to break bonds than is released when new ones are formed
  7. 25. a substance that speeds up a chemical reaction without being permanently changed itself
  8. 26. reaction that gives off thermal energy
  9. 27. a reaction that occurs when a substance reacts with oxygen to produce energy in the form of heat and light
Down
  1. 1. a way to describe a chemical reaction using chemical formulas and other symbols
  2. 2. a chemical reaction in which one element replaces another element in the compound
  3. 4. the starting substances that react in a chemical reaction
  4. 5. a chemical equation with the same number of atoms of each element on both sides of the arrow
  5. 6. the amount of substance that contains 6.02 x10²³ particles of that substance
  6. 7. a reaction in which one substance breaks down, or decomposes, into two or more substances
  7. 9. loss of electrons
  8. 10. substance used to slow down the rates of chemical reactions or prevent a reaction from happening at all
  9. 11. chemical reactions that release energy
  10. 12. a reaction that can occur in both the forward and reverse directions
  11. 13. a change in which one or more substances are converted into new substances
  12. 15. a reaction in which the positive ion of one compound replaces the positive ion of another compound resulting in two new compounds
  13. 16. _________'s principle states that if a stress is applied to a system at equilibrium the equilibrium shifts in the direction that opposes the stress
  14. 17. When the energy needed to keep a reaction going is in the form of thermal energy, the reaction is called an _____ _______.
  15. 18. the mass in grams of one mole of a substance
  16. 20. the substances produced in a chemical reaction
  17. 22. gain of electrons
  18. 24. represent the number of units of each substance taking part in a reaction